Comments on: Episode 009 – Partial Orderings: What’s Wrong with the Olympics?http://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/
Math Podcast For SimiansWed, 21 Sep 2011 08:26:22 +0000hourly1http://wordpress.org/?v=4.1.1By: Nick Hortonhttp://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/comment-page-1/#comment-107
Tue, 06 Apr 2010 23:09:10 +0000http://www.mathforprimates.com/?p=85#comment-107You’re absolutely right. When looking at a phylogenetic tree, it works. When getting specific with individuals in a sex-paired species, it doesn’t. that is, in macro-evolution we have no problems, but in micro-evolution we need to be careful. Great catch!
]]>By: Spoonwoodhttp://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/comment-page-1/#comment-103
Sun, 04 Apr 2010 03:54:31 +0000http://www.mathforprimates.com/?p=85#comment-103“The obstacle above comes as species that have sex. ” This should read “The obstacle above comes FOR species that have sex.”
]]>By: Spoonwoodhttp://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/comment-page-1/#comment-102
Sun, 04 Apr 2010 02:27:35 +0000http://www.mathforprimates.com/?p=85#comment-102Thanks for putting this up! Nice podcasts!

The phylogenetic tree referenced does seem to work as a inf-semilattice (or sup-semilattice if you want to move from present species “upwards” to common ancestors… this depends on the direction in time you want to view things from) in that every two species have a unique common ancestor.

However, the ancestor relation in general doesn’t qualify as a semilattice. Consider the set {Bob, Susan, Steven, Christina, Thomas}, where Bob and Susan have children Steven, Christina, and Thomas. Letting sup mean the most recent ancestor, inf the most recent descendent, sup{Steven, Chrisitina} doesn’t come as a unique element, and {Steven, Thomas} don’t have an inf. Great try though!

The obstacle above comes as species that have sex. So, if we consider species that don’t have sex, then we’ll have a sup-semilattice. As a concrete example apple trees qualify as a sup-semilattice, in that every two apple trees have a common apple tree ancestor.

]]>By: Nick Hortonhttp://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/comment-page-1/#comment-96
Wed, 31 Mar 2010 17:53:44 +0000http://www.mathforprimates.com/?p=85#comment-96Thanks Brittan! We’re having a great time with it. And the response has been surprisingly large and positive. I say surprisingly because let’s face it, lots of people are freaked out by math. But, it confirms our suspicion that most of us actually would like it if it was just presented better.
]]>By: A very long list of podcasts that I have listened to over the course of the past few days | BrainWyrmshttp://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/comment-page-1/#comment-78
Tue, 23 Mar 2010 01:32:55 +0000http://www.mathforprimates.com/?p=85#comment-78[…] Math for Primates Episode 009 – Partial Orderings: What’s Wrong with the Olympics? […]
]]>By: Brittan Starrhttp://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/comment-page-1/#comment-59
Fri, 05 Mar 2010 19:41:19 +0000http://www.mathforprimates.com/?p=85#comment-59Just started listening to your podcasts after reading Tom’s interview at Technoccult. Love what you guys are doing and I certainly will keep listening for as long as you guys make them. Personally, I have always found the subject of math interesting but unapproachable, so I am glad to find a source that takes away the unapproachable aspect and just leaves the interesting. Thanks guys, keep it!
]]>By: Math for Primates episode 009 – Partial Orderings and What’s Wrong with the Olympics « Sapien Gameshttp://www.mathforprimates.com/2010/03/05/episode-009-partial-orderings-whats-wrong-with-the-olympics/comment-page-1/#comment-58
Fri, 05 Mar 2010 15:44:05 +0000http://www.mathforprimates.com/?p=85#comment-58[…] posted our 9th episode over at Math for Primates on Partial […]
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